Kit-bashing and photo-bashing are art creation techniques which involve re-combing found materials into assets for the entertainment industry.
Kit bashing was huge when the practical effects industry still ruled the world of science fiction film. Examples abound in Star-Wars episodes 4-6.
Kit-bashing has been mostly but not entirely done away with by 3D/CG model making.....but Photo-bashing (combing digital photo resources with digital painting techniques to create character, objects, creatures and environments is still alive and well.
Mostly modern examples of kit-bashing:
...and the greatest examples of all?...